Collet chuck operating mechanism



' May 1,1945. 0j. YL-1N 2,375,115

COLLET CHUCK OPERATING MECHANISM Filed March 2, 1943 I N VEN TOR.

osKAR KYLIN Patented May l, 1945 Unirse sir..

:2,375,115 l coLLEfr bonnen .OPERATING MECHANISM fskar lKylin, Cleve'landl- Heights, fOhio, assigner toardons andOliver, Inc.,-fleveland, "Ohio, 'a

.corporationfof Ohio Application March 2, 1943, Serial No. 477,729`

2 Claims.

My invention is an improvement in collets and relates more particularly to an `adjustable operating means therefor.

A present method of adjusting a collet so that its fingers may grip a length of bar stock fed through the collet, is to adjust the linger holder on the spindle. This method is objectionable when the wedge member is power operated because of 'the fact that the back and forth travel of the wedge member is definite.

The present invention aims to overcome this objection by providing an abutment sleeve for sliding the collect tube and by providing amember adjustably positionedon the abutment sleeve to-more effectively utilize the bar gripping stroke of the wedge member. y

Another object of .the invention isto provide asimpleadjustable means of the class described which is positive .in operation and which affords,

a meansfor accurately controlling the power operation of the collet fingers.

Other objects and advantages of my invention will become more apparent as the lfollowing descrip-tion of one embodiment 'thereof progresses, reference being made to the accompanying drawing in which like reference characters are em- ,y wedge.

ployed to designate like parts throughout the end portion of the collet showing the power operated wedge and tube operating lingers,

Figure 3 is a rear end view of the device shown in Figure 2, and

Figure 4 is a vertical section taken on line 4 4 of Figure 2.

In the embodiment of the invention illustrated in the drawing I have shown a power operated spindle collet for gripping bar stock fed into position for a working operation on a machine tool. Ihe power .operating means may be motivated in any suitable manner, but in the present illustration I have shown hydraulically actuated means somewhat similarl to that illustrated in a copending application of Oskar Kylin, Henrik O. Kylin, and Michael Valentino, Serial No. 442,626, led May l2, 1942. More specically there may be provided a Divoted hydraulic cylinder I in which the piston 2 operates in response to the actuation suitable control valves and associated mechanism which is not duplicated here since the present invention has to do more parl the pusher sleeve I8 as at I9.

age t, 4 Aand /5 to its eXtreme limit of travel to the right vin Figure 1.

The wedgemember 3 vis slidably keyed at 6 to rotate with the spindle .'I` and is provided with an inwardly sloping wall 3 and a substantially horizontal or cylindrical wall or land 9. yActuating 'fingers I0 pivoted at II on the end member I2 extend forwardly and terminate in rollers 4It which .are adapted to restor ride upon the wedge surfaces orig dependingupon'theposition of the Thengers It are yeachprovided with a depending arm or projection Ill having a rounded or curved end bearing surface I5. These projections extend into ,and operate within the slots I6 formed 'in the adjusting ring lII threaded .on to The,1; ush`er sleeve It Aisformed at its-outer end with y.an enlarged end portion .'20 having a plurality of spaced sockets or seats 2| arranged about its periphery as seen more clearly in 'Figure 3, while the end member I2 is provided with a radially disposed spring pressed detent as in dicated at 22. In this manner accidental relative rotational movement between the sleeve and the spindle is prevented. The end member isl threaded on to the rotatable spindle tube 'I as at 23 and'is locked in place :by means of the locking screw 24. 'I'hus the whole assembly including the spindle tube 1, the wedge 3, the end member I2 and its associated ngers together with the sleeve I8 will rotate as a unit during a working operation.

In a collect chuck of the type disclosed where the wedge member is power actuated it has a very definite limit of travel back and forth on the spindle tube, and in order to obtain the maximum gripping efficiency in the collet fingers it has heretofore been necessary to accurately adjust the iinger holderon the spindle. With the present invention, however, the adjusting means may be embodied in the end member and may be actuated without disturbing the position of the end member on the tube 1.

The adjusting ring I'I is threaded on to the threaded rear end of the pusher tube I8 so that the slots I6 face rearwardly to accommodate seen in Figure 2y the rounded or curved surfaces I of the arms' I4 abut the rear walls 25 of the slots in the ring I1 and as the Wedge is moved toward the extreme left position which is illustrated, the rollers I3 will climb the inclined wall 8 and come to rest on the land 9 as shown. In this position the arms I4 have caused the pusher sleeve I8 to travel to the right and to push the tube 25 and the collet memberr21 in that direction to effect a strong vgripping action by the collet fingers 28 upon a length of bar stock extending through the collet assembly,

It will .be seen therefore that if the gripping stroke of the pusher tube I8 isto be adjusted to provide a stronger gripping eiort in the collet chuck, the ring abutment I1 must be adjusted slightly to the left on the sleeve and conversely if the full gripping stroke is to be shortened the abutment ring I'I may be adjusted tothe right` on the sleeve I8. Such adjustments are easily accomplished without disturbing the end member I2 by merely rotating the sleeve I8 in the desired direction relative to the spindle I by applying a wrench or other tool having pins or projections which seat in the sockets 29 formed in the end of the sleeve I8. The sleeve may then be rotated in either` direction. Since the arms I4 of the finger I 0 operate in the slots vI6 of the abutment ring and since the sleeve isgbeing rotated relative to the end memberv I 2 and the tube 1, the ring I1 will be advanced or retracted on the sleeve I8. When the proper adjustment is obtained the detent 22 will enter one of the sockets 2| and thereby tend to prevent further relative rotational movement between the sleeve and the end member during'the'rotation of the spindle. 'l

It will be seen that by this invention, I have provided a very simple means for eiecting and maintaining an accurate gripping adjustment for a collet chuck employing a power operated wedge member for operating the chuck, and that the desired adjustment may readily be made from the rear of the collet assembly by simply rotating the pusher sleeve relative to an abutment ring and the collet end member and without adjusting the end member relative to the spindle tube 'L 1 Various changes may be made in the details of construction of my invention without departing from the spirit of the same or the scope of the following claims.

I claim:

1. The combination with a rotary hollow spindle and a chuck or collet carried by the spindle, of a pusher tube slidable in the spindle, a body rotatable with the spindle, fingers pivotally carried on the body, means slidable on the spindle for operating said iingers radially of the body, a member insertible into an end of the spindle and having a portion abutting an end of said pusher tube, and an abutment adjustably carried by said member and engageable with portions of said levers to transmit a thrust to the pusher tube when said iingers are moved radially in one direction and means for removably locking said member against relative rotational movement with respect to the spindle, but permitting relative sliding movement therebetween said means including relatively movable cooperating members carried by said insertible member and by said body.

L2. The combination with a rotary hollow spindle and a chuck or collet carried byv the spindle, of a pusher tube slidable in the spindle, a body rotatable with the spindle, iingers pivotally carried on the body, means slidable on the spindle for operating said iingers radially of the body, a member insertible into an end of the spindle and having a portion abutting an end of said pusher tube, and an abutment adjustably carried by said member and engageable with portions of said levers to transmit a thrust to the pusher tube when said ngers are moved radially in `one direction, said member having a threaded portion for receiving said abutment in a selected axial adjustment. thereon, said abutment member having va plurality of openings for receiving the portions of the levers engageable with said abutment, and means for releasably engaging the body with said member to prevent accidental relative rotation but permitting relative sliding movement therebetween.

OSKAR KYLIN. 

